I have two domains that need to be on every mailbox and distribution list.

I believe "list" is the mailenable equivalent to Exchange's distribution groups, if so then it should have the ability to add a domain alias to each list.

For example I need test@plc.domain.com and test@domain.com to both work, test@plc.domain.com would be the primary and the address that recipients see. I still need to receive on test@domain.com though.